I have heard from several other people who tried to use it for dyno applications and gave up because of exactly the issue I am having. One thing I haven't tried though is using it on track in "Flight" mode. With all the other calibration issues in car mode maybe that could be it. I'll give that a try next week.

Thanks for the update. It sounds like there may be a noise issue or other issue with the ESC's pulses that are making it incompatible with the brushless sensor. What brand/model of ESC do you have, out of curiosity?